510 NEW AND RARK FRPISHWATER AhdM, 



Stein, in Naturg. d. Flagell., ii., T. i., f. 27-38, figures it as Dino- 

 pyxis fcevis Stein. He shows a pair of c.v. in front; the large 

 posterior globule, he considers the nucleus; and the smaller central 

 bodies, pyrenoids (two appear in his figures). Lemmermann, 

 however, Reise n.d. Pacific, p. 361, mentions Dinopyxis /cevis as 

 a synonym of Exnviella Lima (Ehr.) Schtitt, {Crypfomonas Lima 

 Ehr.), quoting Schtitt, G^^mnodiniacese, p. 8, fig. 9 (in Engler c^- 

 Prantl, I.e.). Schewiakow's genus and species, therefore, would 

 seem to be invalid. As a freshwater form, it is kno^n only 

 from Australia. 



CONJUGATE. 



Genus S p i r o g y r a Link. 

 Spirogyra Lismorensis Playf. 

 Biol. Richm. River, p.28, PI. iii., f. 1. Noted also from the 

 Nymboidia River (Grafton Water-supply), infertile. It seems, 

 therefore, to be a plankton-form. 



Spirogyra mirabilis (Hass.) Kutz. (Text-fig. 4). 



Diam. cell. veg. 15-23, alt. 230-245: cell.fruct. max. 25-42, alt. 

 180-190; zygosp. 21-34, alt. 44-93/x. 



Lismore (308). 



Cf. Petit, Spir. de Paris, p. 14, PL iii., f.3, 4; Borge (in Pascher, 

 Susswasserti. Deutschl.) Zygnemales, p.21, f.l7. This seems to 

 be the first record of the conjugation of Sp. mirahilis, as Borge, 

 I.e., 1913, says ^'ICopulation nicht hekaimt'' The vegetative cells 

 were very long, 10-16 times the diameter; there was one chloro- 

 plast making 3 J- 4 turns. With this species should be compared 

 Sp. Spreeiana Rabh. The two are so very much alike, both in 

 characteristics and dimensions, that, in spite of the replicate cell- 

 ends of the latter, I am not convinced that they are distinct 

 species. Moreover, Hirn, Finlandischen Zygnemaceen, p.ll, f.4, 

 in Sp. kuusamo'ensifi ( = a more slender form of Sj^. Sjyyeeiana) 

 and in /Sp. Spreeia7ia itself. I.e., p. 12, f.5, shows both simple and 

 replicate septa in the same filament. So also Borge, in Spirogyra 

 spp., Sibiriens Chloroph., p. 8, f. 2, 3 { = Sp. SpreeAana stouter 



